Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
What happens when you try opening applications from start menu?
Is the issue only while opening Excel attachments or even with other Office attachments as well?
Try to add the dword value for Excel and check the result:
Click on start->run->copy and paste the below dword and click ok.
reg add HKCU\Software\Microsoft\Office\14.0\Excel\Options /v NoReReg /t REG_DWORD /d 1
If the above steps fail to fix the issue, you may follow the steps given in the below article to remove Office completely form the machine and then check the result:
http://support.microsoft.com/kb/928218
Note:
- Read the disclaimer before modifying or deleting registry keys.
- You can follow the same steps from the article instead of 12.0 you may look for 14.0 which is for Office 2010
Instead of Office12 folder you may look for Office14 folder
Restart computer and then try re-installing Office 2010, check if it helps you.